Low-temperature formation of the FePt phase in the presence of an intermediate Au layer in Pt /Au /Fe thin films

I. A. Vladymyrskyi, A. E. Gafarov, A. P. Burmak, S. I. Sidorenko, G. L. Katona, N. Y. Safonova, F. Ganss, G. Beddies, M. Albrecht, Yu N. Makogon, D. Beke

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Pt /Fe and Pt /Au /Fe layered films were deposited at room temperature by dc magnetron sputtering on Al2O3(0 0 0 1) single crystalline substrates and heat treated in vacuum at 330 °C with different durations (up to 62 h). It is shown by secondary neutral mass spectrometry depth profiling and x-ray diffraction that the introduction of an additional Au layer between Pt /Fe layers leads to enhanced intermixing and formation of the partially chemically ordered L10 FePt phase. The underlying diffusion processes can be explained by the grain boundary diffusion induced reaction layer formation mechanism. During the solid state reaction between Pt and Fe, the Au layer moves towards the substrate interface replacing the Fe layer. This was explained by the much faster diffusion of Fe, as compared to Pt, along the grain boundaries in Au. Enhancement of the process and formation of the ordered FePt phase in the presence of the Au intermediate layer were interpreted by the effect of stress accumulation during the grain boundary reactions: the disordered FePt phase formed initially at different Au and Pt grain boundaries can experience appropriate compressive stress along the {1 0 0} directions, which can initiate the formation of the chemically ordered L10 FePt phase.

Original languageEnglish
Article number035003
JournalJournal of Physics D: Applied Physics
Volume49
Issue number3
DOIs
Publication statusPublished - Dec 9 2015

Fingerprint

Grain boundaries
Thin films
thin films
grain boundaries
Temperature
Depth profiling
Substrates
Solid state reactions
Compressive stress
Magnetron sputtering
Mass spectrometry
Diffraction
Vacuum
Crystalline materials
X rays
magnetron sputtering
x ray diffraction
mass spectroscopy
solid state
heat

Keywords

  • grain boundary diffusion
  • grain boundary motion
  • L1 phase
  • magnetic thin films
  • solid state reaction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Low-temperature formation of the FePt phase in the presence of an intermediate Au layer in Pt /Au /Fe thin films. / Vladymyrskyi, I. A.; Gafarov, A. E.; Burmak, A. P.; Sidorenko, S. I.; Katona, G. L.; Safonova, N. Y.; Ganss, F.; Beddies, G.; Albrecht, M.; Makogon, Yu N.; Beke, D.

In: Journal of Physics D: Applied Physics, Vol. 49, No. 3, 035003, 09.12.2015.

Research output: Contribution to journalArticle

Vladymyrskyi, IA, Gafarov, AE, Burmak, AP, Sidorenko, SI, Katona, GL, Safonova, NY, Ganss, F, Beddies, G, Albrecht, M, Makogon, YN & Beke, D 2015, 'Low-temperature formation of the FePt phase in the presence of an intermediate Au layer in Pt /Au /Fe thin films', Journal of Physics D: Applied Physics, vol. 49, no. 3, 035003. https://doi.org/10.1088/0022-3727/49/3/035003
Vladymyrskyi, I. A. ; Gafarov, A. E. ; Burmak, A. P. ; Sidorenko, S. I. ; Katona, G. L. ; Safonova, N. Y. ; Ganss, F. ; Beddies, G. ; Albrecht, M. ; Makogon, Yu N. ; Beke, D. / Low-temperature formation of the FePt phase in the presence of an intermediate Au layer in Pt /Au /Fe thin films. In: Journal of Physics D: Applied Physics. 2015 ; Vol. 49, No. 3.
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AU - Safonova, N. Y.

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